= AE220: Aerospace Structural Mechanics =
''' Introduction: ''' This course deals with aerospace structural analysis.

'''Credits: '''
8 (3L-1T-0P-8C)

'''Prerequisites: '''
AE209 (Solid Mechanics)

'''Course Contents: '''
 * Introduction: semi-monocoque aerospace structures - Loads and Design considerations; construction concepts, layout, nomenclature and structural function of parts (spar, rib, longeron, stringers, skin, bulkhead etc.), strength vs stiffness based design.

||{{attachment:attachment_ae220-2.gif|Wing Structure and Terminology|align="middle"}}||||{{attachment:ae220-1.jpg|Breakout of Advanced Materials in 777|align="middle"}}||
||Image Courtesy: [[http://www.nomenclaturo.com/wp-content/uploads/Airbus-wing-structure-and-Terminology.gif | www.nomenclaturo.com]]||||Image Courtesy: [[http://www.asminternational.org/images2/cof/centen_1003.pdf | Brian Smith, Boeing Aircraft Co. (ASM International)]]||

 * Torsion of non-circular prismatic beams:  importance of warping; St. Venant or Prandtl’s formulation; Membrane analogy and its application to narrow rectangular cross-section.


 * General formulation of Thin-Walled Beam (TWB) Theory: Cartesian and midline systems, CSRD & thin-wall assumptions, general expressions for dominant displacement, strain and stress fields, equilibrium equations in midline system, stress resultants and general boundary conditions.
 
 * Torsion and Bending of TWBs: Torsion of single and multi cell closed sections - Bredt-Batho theory, shear flow, torsion constant, free warping calculation, concept of center of twist, torsional equilibrium equation and boundary conditions. Torsion of open TWBs without warp restraint, primary & secondary warping, St. Venant torsion constant. Uncoupled bending of open, closed, single cell, multi-cell TWBs - axial stress, shear flow, shear centre, displacement analysis. Torsion of open section TWBs with primary warp restraint - concept and theory of torsion bending, torsion bending constant, secondary warping restraint. Unsymmetric bending and coupled bending torsion analysis.
 
 * Buckling of TWBs: Concept of structural instability, flexural buckling analysis, bending of beams under combined axial and lateral loads, short column and inelastic buckling. Pure torsional buckling and coupled flexural-torsional buckling of open TWBs. Introduction to the concept of buckling of plates, local buckling of TWBs. Introduction to buckling and post-buckling of stiffened skin panels, ultimate load carrying capacity of a typical semimonocoque TW box-section. Introduction to tension-field beams.

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''' Text Books: '''
 1. Megson, T. H. G., Aircraft Structures for Engineering Students, Butterworth-Heinemann, 4th Ed., 2007. (Available in Library)
 2. Peery, D. J., Aircraft Structures,McGraw-Hill Education, 1st Ed., 1950 (Available in library)
 3. Donaldson, B. K., Analysis of Aircraft Structures (Cambridge Aerospace Series), 2nd Ed., Cambridge University Press, 2008
 4. Sun, C. T., Mechanics of Aircraft Structures, Wiley-Interscience, 1998 
 5. Bruhn, E. F., Analysis and Design of Flight Vehicle Structures, Jacobs Pub., 1973
 6. Niu, M., Airframe Stress Analysis & Sizing, Adaso Adastra Engineering Center, 1998
 7. Cutler, J. and Liber, J., Understanding Aircraft Structures, Wiley Blackwell, 4th Ed., 2006

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''' Internet Resources '''
 * [[http://sydney.edu.au/engineering/aeromech/structures/as/ | Aircraft Structures Course, University of Sydney]]
 * [[http://ocw.mit.edu/courses/aeronautics-and-astronautics/16-20-structural-mechanics-fall-2002/ | Structural Mechanics Course, MIT OpenCourseWare]]

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''' Interesting Links '''
 * [[http://www.youtube.com/watch?v=sA9Kato1CxA&feature=results_video&playnext=1&list=PL27FE9E020AE45A5F | Boeing 787 Wing Break Test]]
Video shows the testing of a Boeing 787 Dreamliner wing.
 * [[http://www.youtube.com/watch?v=Ai2HmvAXcU0&feature=related | Boeing 777 Wing test]]
Video shows the testing of Boeing 777 wing.
 * [[http://www.youtube.com/watch?v=ioIgkejlUhk&feature=results_main&playnext=1&list=PL4150F782BA5449AC | Video showing the skeleton of RANS S-19 Venterra]]
Video shows skeleton of RANS S-19 Venterra. Wing box, spars, ribs, longerons are be clearly seen.